Modified Newtonian Dynamics (MOND) can fit a broad range of galaxy kinematic data, but struggles with clusters of galaxies. MONDian clusters need dark matter, and here we test the 11 eV/c sterile neutrino used to fit the first three acoustic peaks of the cosmic microwave background by investigating their equilibrium distributions in 30 groups and clusters over a wide range of temperatures. We d...

We present a comprehensive study about the phenomenological implications of theory describing Galactic cosmic-ray scattering onto magnetosonic and Alfv\'enic fluctuations in $\mathrm{GeV} - \mathrm{PeV}$ domain. compute set diffusion coefficients from first principles, for different values Mach number other relevant parameters associated to both halo extended disk, taking into account damping m...

Cosmic acceleration is explained quantitatively, purely in general relativity with matter obeying the strong energy condition, as an apparent effect due to quasilocal gravitational energy differences that arise in the decoupling of bound systems from the global expansion of the universe. “Dark energy” is recognised as a misidentification of those aspects of gravitational energy which by virtue ...

cosmic rays (cr) travel at speeds essentially indistinguishable from the speed of light. however whilst travelling through magnetic fields, both regular and turbulent, they are delayed behind the light since they are usually charged particles and their paths are not linear. those delays can be so long that they are an impediment to correctly identifying sources which may be variable in time. fu...

Based on thermal equilibrium between the vacuum and its relevant excita-tions a model for cosmic inflation is presented. As far as the vacuum structure is concerned the model is entirely classical. Due to a U(1) gauged inflaton field an inflationary regime can be reached without explicitly imposing slow-roll conditions. Thereby, nontrivial euclidean BPS saturation of the inflaton effectively su...

Dark-matter halos are the scaffolding around which galaxies and clusters are built. They form when the gravitational instability of primordial density fluctuations causes regions which are denser than average to slow their cosmic expansion, recollapse, and virialize. Objects as different in size and mass as dwarf spheroidal galaxies and galaxy clusters are predicted by the CDM model to have hal...

Neutrinos mediate long range forces among macroscopic bodies in vacuum. When the bodies are placed in the neutrino cosmic background, these forces are modified. Indeed, at distances long compared to the scale T −1 , the relic neutrinos completely screen off the 2-neutrino exchange force, whereas for small distances the interaction remains unaffected. Dispersion potentials arising from double pa...

The problem of the character of gravitation is approached by discussing three main possible modes of action from the historical, theoretical and empirical standpoints. The “Newtonian” mode of action-at-a-distance (AAAD)—in which Newton himself did not believe—is followed through three centuries, though the aim is not historical accuracy. This approach includes several Webertype theories of velo...